材料期刊网

为建立复合材料宏细观尺度之间电磁响应的关联性,将分层多尺度计算方法应用于纤维复合材料电磁屏蔽效能计算。为准确描述复合材料宏细观之间的联系,以电磁屏蔽效能为衡量标准,确定了复合材料细观结构的代表性体积单元（RVE）。根据电磁场媒质本构方程计算了RVE的等效电磁参数。采用分层多尺度方法计算复合材料宏观构件的电磁屏蔽效能。结果表明工作频率越高则复合材料的RVE越小;所设计的纤维复合材料结构在工作频率2～18GHz范围内具有38dB以上的电磁屏蔽效能,且电磁屏蔽效能随工作频率增加而下降。研究方法适用于求解细观结构相分散均匀或分布有规律的任意形状复合材料宏观构件电磁屏蔽效能。

In order to establish the correlation of electromagnetic response between macro-scale and meso-scale of composites, the hierarchical multi-scale calculation method was applied to the calculation of electromagnetic shielding effectiveness of fiber composites. In order to describe the relationship between macro-scale and meso- scale of composites accurately, representative volume elements （RVE） of the composites meso-structure was determined by the measure criterion of electromagnetic shielding effectiveness. The equivalent electromagnetic parameters were calculated by the constitutive equation of electromagnetic field medium. The electromagnetic shielding effectiveness of fiber composites macro component was calculated by hierarchical multi-scale calcula- tion method. The results showed that： the RVE of composites becomes smaller with the increasing of working frequency, the electromagnetic shielding effectiveness of fiber composite structures was above 38dB in the range of working frequency from 2 to 18GHz, and the electromagnetic shielding effectiveness decrease with increasing of working frequency. The research method was suitable to solve electromagnetic shielding effectiveness of composites macro component of arbitrary shape which has uniform dispersion and regular distribution of meso- structure phase.